diff --git a/bots/coniksbot/internal/cmd/version.go b/bots/coniksbot/internal/cmd/version.go
new file mode 100644
index 0000000..68b5d2a
--- /dev/null
+++ b/bots/coniksbot/internal/cmd/version.go
@@ -0,0 +1,22 @@
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/coniks-sys/coniks-go/internal"
+	"github.com/spf13/cobra"
+)
+
+var versionCmd = &cobra.Command{
+	Use:   "version",
+	Short: "Print the version number of coniksbot.",
+	Long:  `Print the version number of coniksbot.`,
+	Run: func(cmd *cobra.Command, args []string) {
+		fmt.Println("All software has versions. This is coniksbot's:")
+		fmt.Println("coniksbot v" + internal.Version)
+	},
+}
+
+func init() {
+	RootCmd.AddCommand(versionCmd)
+}
diff --git a/client/coniksclient/internal/cmd/version.go b/client/coniksclient/internal/cmd/version.go
new file mode 100644
index 0000000..8bc8ddf
--- /dev/null
+++ b/client/coniksclient/internal/cmd/version.go
@@ -0,0 +1,22 @@
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/coniks-sys/coniks-go/internal"
+	"github.com/spf13/cobra"
+)
+
+var versionCmd = &cobra.Command{
+	Use:   "version",
+	Short: "Print the version number of coniksclient.",
+	Long:  `Print the version number of coniksclient.`,
+	Run: func(cmd *cobra.Command, args []string) {
+		fmt.Println("All software has versions. This is coniksclient's:")
+		fmt.Println("coniksclient v" + internal.Version)
+	},
+}
+
+func init() {
+	RootCmd.AddCommand(versionCmd)
+}
diff --git a/internal/version.go b/internal/version.go
new file mode 100644
index 0000000..8cd5a2a
--- /dev/null
+++ b/internal/version.go
@@ -0,0 +1,4 @@
+package internal
+
+// Version of executables.
+var Version = "0.0.0+git"
diff --git a/keyserver/coniksserver/internal/cmd/version.go b/keyserver/coniksserver/internal/cmd/version.go
new file mode 100644
index 0000000..dd9314d
--- /dev/null
+++ b/keyserver/coniksserver/internal/cmd/version.go
@@ -0,0 +1,22 @@
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/coniks-sys/coniks-go/internal"
+	"github.com/spf13/cobra"
+)
+
+var versionCmd = &cobra.Command{
+	Use:   "version",
+	Short: "Print the version number of coniksserver.",
+	Long:  `Print the version number of coniksserver.`,
+	Run: func(cmd *cobra.Command, args []string) {
+		fmt.Println("All software has versions. This is coniksserver's:")
+		fmt.Println("coniksserver v" + internal.Version)
+	},
+}
+
+func init() {
+	RootCmd.AddCommand(versionCmd)
+}